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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c6ffb6273bf0cf4edf5bb27af4cdaad691e38b0163f1b2beb2eec11fae479d5' 
  AND token = 'y194o3/mriV6A6R0LgZSvCyapZowjUNieagJj98cKig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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