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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1749f208d0aeb7a4ff59c9470abbf726e369820c9088ca77186b393ce71da40f' 
  AND token = 'By/R7PM0kpHtXrpw/gw/91xR1q5+141iCk5HjMYDsC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00350

JSON explain

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