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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '111b709f28156a4e850c954f10bef71c026e86a550c26574918366213f230cdc' 
  AND token = 'dSlfogs8ZN+iARN8f0fNl5bt60dkYqu8O9/DXe/GIMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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