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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2001da628dffa5e0eefa12f8332ba1590fecdd45c7a1e6d07f6c46cd84bff92' 
  AND token = 'Rs+fTqV9FbCtaIE0kPfF/W06y5SXb6GFxL/1iv/1tiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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