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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ab74caf70326e764ae00c636ce47526c0b7d1660e4965a93a31194f024b5c1' 
  AND token = 'lvnfSNIk2OICl+J6BnwrtbjCOmq58AyeB+hU8g3vdTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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