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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa260041422f674baec5bdee10c09c3403551a0e0a8ae222a0a9ca6597e9a49' 
  AND token = 'PG8gLFh7tde6tV8O95FseGlmQh8Ha7jbr9ZR5yBtcjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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