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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f27758cea9646986d3c18d2124995b66627eabc15d1a7e7516833dda13b90e' 
  AND token = '0bOMhC3yyc7x+szqGZOrXoqoN4Ln6QXw4bbC2D3AAgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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