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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a825bbf2f93fa8f6177d9ed322952aced1456c848710b1c5901976b0388314' 
  AND token = 'uejkNSUOZcgFzkF7k7v01bIJRIhgf9HBxyKMNrm4OxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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