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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf8bfb92c8513f3076aeed089eb9c8278aea49f34e543e99ca0851f5f1763d9' 
  AND token = '+1RpFEKnPTpS8TiM3JwOfo9MSUO90wvATGaQfXvwnTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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