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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ecaf825eef0b5826af6cf3580537b8e8179fd028afe55f88aa9a92927b6ffb' 
  AND token = 'cbiEeFOu8U571AtlLDpHYB+StNWFvfJ/nCuAuAT8B7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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