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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9704acdabc3879f535e5eac5d1d400a0928a1a5da2086434a03df90d198a4f' 
  AND token = 'wPi8QOZvLaVUKSPpxnaSDmjU3PesgXw333er0cNE6Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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