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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdab21fbe5d8201359ab5939e1d1c8a7e875f1a26066985b87ee702df288309d' 
  AND token = '/AuJNb3xINqGQ/0EUYtc0dE13Nc9+T11xPRQiwZPcI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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