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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f16f1d5cf09e710922839612b447d6d4dcb34cb486467a47131912f2e84ca1' 
  AND token = 'oxKa+lSnETulyui52KYVlQqxWo/97FIRt5IysW4PUZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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