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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1174bb40d9f0e9b1f72c630f62e66ed2239019189adb8f681ceadabe8ec91e9' 
  AND token = 'BkpKYFGiIFggYYeQKb4Rps+4Ji6otEM1kRXqe50wHWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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