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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6777daab0916f9abacb7ed45b150ee9bb8a9332be789d3e97e312cfa20fb1677' 
  AND token = 'WxY4iE8/lN5Tbqt1EHrrHTHnsdSI6XIoBMXIR8v4C00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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