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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8f2b4b03d1e4218abc9cbea586930fc411932ede2bb36a098742da8ff7a0ad' 
  AND token = 'BBbHVoAWKbFRh7FLFp6lOEVW0TNQbx73PbxpoPRaKus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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