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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d3ef5f5b17fe6e796c26417a808acfb009efc7ad2b246ec11d3e29e757467b8' 
  AND token = 'pJeUESeselZ0bIYQR4M5xojYybDsOxloIPOkjz61J94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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