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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5b3eeb33cdb5effe78fefa7d0d99e22bddddd26065b4d8cc2e2e5609b3570fa' 
  AND token = '8To/e/nnaOu/F3sMjSvnkXpcghzWGsHZzg4jNz6ZGsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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