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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd230c5f88604312e03a4b0487f466831e4eca599f321e45781ea576182a73124' 
  AND token = 'H7NzM9CfK0wJ341jjeg26/dY/ORCKmXhWt74SauTFfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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