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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9a73f3877cfcf05180254215fd00655d44f8b445b4d9189660a09068177598' 
  AND token = 'U7hDXb8cSHTGmqObSLfTS6CtWSOdE2urciFPo/qTSi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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