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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cbfd515547e518599d259e2994e83886ec2c8cb8d3f49b43c873c2073e41c3' 
  AND token = 'BALA2vEp6xXQNWQOr4eYsE2K7aM3OMpWtxX7quqkz1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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