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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360607a096d03ef335d0d4aee2ae44879f7f6251806824826ce9a5e934eabf39' 
  AND token = 'K5rRbU/59ewhEaRkjU33ODZI4Co7f7lRXW9pDiVeeh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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