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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177a86c339a78e4862b05cd9631ae569cfbc6ede405bb58caa2c351a0c8974fc' 
  AND token = 'EIaPWy3GitxqvjFHF155KslZiHJTT8j9wqRENdnOyNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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