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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aefd6cd90af9d6f000e58f7d8c4227cbfa17ac77f5f0ddc4c979335e3386a1b4' 
  AND token = 'C/lNigII1lncdJ//2DRIUHmsnnqhUq6CZVSD61PQ1Uc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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