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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3678c41441d1ce064010a122cee39b751a84ed78ac9a01a42fc9fe08b98ef729' 
  AND token = 'oQWc/Kmb7oLf7uuUJBl/bHbt3qliyg6w2bVMCYVXBdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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