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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dba187547e9b6477435f274a0824e884951009d505f8c40629e02c04c587c0c' 
  AND token = 'krFcZwLPnog4dmjRgXnwRRjrGk/7ka5fWPko48wf64o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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