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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fde86ca625c7957ecf6bd482f17f8d5fabfac75e09ba0741d46fb6d31fdb4fb8' 
  AND token = 'cerCiBVQ86zf/9kBPezl1SZe/TVai1RoH2AewUv4VLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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