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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603ce0a818ae549c5abd9e9f44004ff91c89858e20fce455694f5d20e6b66709' 
  AND token = 'BeBY10e4wExsmji2SsplZCvndmT0AoukImm/oAgx0U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}