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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c43f12f0442c46266e4ff8de4fdb71cb81ec6b194eff2c7e64d1cee5c18e1937' 
  AND token = 'SYgEls6yXvj98GmXgDutk0pMhLsUyg8J1V89/U8B1s0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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