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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0b4dd91fde6d664b2d1a5bb10eb3bbec9658353de2d8ad4c73170edc656878' 
  AND token = 'oBGvFQUgNHvT/sX/cmi00eQizW1R6QCxKiAAFvAOgY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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