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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9659ea8d851dfca07ac525d1b5770dfefb9e8671db37df225d7bce2b54067ab6' 
  AND token = 'Or6cCF1RSp7ZweZXLz/QuiB2/Eq8yKdJL0Zhk4r6nVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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