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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1298f087a04a0b83f218aacda7de68921b4b1180db7e5b13ca9915fab9360c6' 
  AND token = 'SY7NZ7vNbOB8UM+9gKdnbpe6VZ1zZRECuohlSD+x3TI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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