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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04fb23cf168270b84031beae235a63231c592d0f465bd7ae5752a79f34bec679' 
  AND token = '0BwM3B/etbxkTu5Iztmzh4ucu6QfAtyXDB/iqp+BH88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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