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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffa72ce8c512ca45cafec2f112ca668ffc205829f87db675c9b708bb11514caa' 
  AND token = 'DogwuwpypkNHnJJ+bdK5WeZ0FrT4l3haUDBRjfmeZjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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